*melanin: the pigment produced by your skin that gives it a tanned colour. 2. Take your time, and build your tan up slowly. Everyone reacts differently to the sun, but here are some guidelines to get you started: If tanning in the sun, start with only 15-20 minutes in the sun on your first session. In your following tanning sessions only increase your time by 5-10 minute increments, and monitor your skin regularly to make sure you arenât starting to go red and burn. If tanning on a sunbed, start with 2-3 minutes.
Over 2,000 years, many imperial dynasties and kingdoms built, rebuilt, and extended walls many times that subsequently eroded. The latest imperial construction was performed by the Ming Dynasty (1368â1644), and the length was then over 6,000 kilometers (3,700 miles). This is the wall often referred to when we talk about the Great Wall.
Updated March 03, 2017. The Great Wall of China is not a continuous wall but is a collection of short walls that often follow the crest of hills on the southern edge of the Mongolian plain. The Great Wall of China, known as long Wall of 10,000 Li in China, extends about 8,850 kilometers (5,500 miles). Building the Great Wall of China A first set of walls, designed to keep Mongol nomads out of China, were built of earth and stones in wood frames during the Qin Dynasty (221-206 BCE). Some additions and modifications were made to these simple walls over the next millennium but the major construction of the modern walls began in the Ming Dynasty (1388-1644 CE).